tail

官方地址：https://github.com/hpcloud/tail

功能：实现类似于Linux中tail -f功能

测试：

package main
import (
    "fmt"
    "github.com/hpcloud/tail"
    "time"
)
func main() {
    filename := "./app.log"
    tails, err := tail.TailFile(filename, tail.Config{
        ReOpen: true,
        Follow: true,
        // Location:  &tail.SeekInfo{Offset: 0, Whence: 2},
        MustExist: false,
        Poll:      true,
    })
    if err != nil {
        fmt.Println("tail file err:", err)
        return
    }
    var msg *tail.Line
    var ok bool
    for {
        msg, ok = <-tails.Lines
        if !ok {
            fmt.Printf("tail file close reopen, filename:%s\n", tails.Filename)
            time.Sleep(100 * time.Millisecond)
            continue
        }
        fmt.Printf("msg(%T): %v\n", msg,msg.Text)
    }
}

go mod init
go build